gawk: Command-line directories
4.13 Directories on the Command Line
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According to the POSIX standard, files named on the 'awk' command line
must be text files; it is a fatal error if they are not. Most versions
of 'awk' treat a directory on the command line as a fatal error.
By default, 'gawk' produces a warning for a directory on the command
line, but otherwise ignores it. This makes it easier to use shell
wildcards with your 'awk' program:
$ gawk -f whizprog.awk * Directories could kill this program
If either of the '--posix' or '--traditional' options is given, then
'gawk' reverts to treating a directory on the command line as a fatal
error.
Extension Sample Readdir for a way to treat directories as
usable data from an 'awk' program.
Info Catalog
gawk: Retrying Input
gawk: Reading Files
gawk: Input Summary